<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>404 - 页面未找到</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1e3c72, #2a5298);
            color: #ffffff;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            text-align: center;
            overflow: hidden;
            position: relative;
        }
        .stars {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
        }
        .star {
            position: absolute;
            width: 2px;
            height: 2px;
            background: white;
            border-radius: 50%;
            box-shadow: 0 0 10px 2px rgba(255, 255, 255, 0.8);
            animation: twinkle 4s infinite;
        }
        @keyframes twinkle {
            0% { opacity: 0.2; }
            50% { opacity: 1; }
            100% { opacity: 0.2; }
        }
        .container {
            max-width: 600px;
            padding: 40px;
            background-color: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(255, 255, 255, 0.18);
            z-index: 10;
            position: relative;
            transform: translateY(0);
            animation: float 6s ease-in-out infinite;
        }
        @keyframes float {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-20px); }
            100% { transform: translateY(0px); }
        }
        h1 {
            font-size: 8rem;
            margin-bottom: 20px;
            color: #ffffff;
            font-weight: 700;
            text-shadow: 0 0 20px rgba(255, 255, 255, 0.5);
            letter-spacing: 10px;
            animation: glow 2s ease-in-out infinite alternate;
        }
        @keyframes glow {
            from { text-shadow: 0 0 20px rgba(255, 255, 255, 0.5); }
            to { text-shadow: 0 0 30px rgba(255, 255, 255, 0.8), 0 0 40px rgba(100, 200, 255, 0.8); }
        }
        p {
            font-size: 1.5rem;
            margin-bottom: 30px;
            line-height: 1.5;
            opacity: 0.9;
        }
        .astronaut {
            position: absolute;
            width: 150px;
            height: 150px;
            bottom: -50px;
            right: -50px;
            animation: spin 20s linear infinite;
            z-index: -1;
            opacity: 0.7;
        }
        @keyframes spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }
        .planet {
            position: absolute;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: radial-gradient(circle at 30% 30%, #ff6b6b, #c92a2a);
            top: -100px;
            left: -100px;
            box-shadow: 0 0 50px rgba(255, 107, 107, 0.5);
            z-index: -1;
            animation: pulse 4s ease-in-out infinite;
        }
        @keyframes pulse {
            0% { transform: scale(1); }
            50% { transform: scale(1.05); }
            100% { transform: scale(1); }
        }
    </style>
</head>
<body>
    <div class="stars" id="stars"></div>
    <div class="container">
        <h1>404</h1>
        <p>抱歉，您访问的页面不存在或已被移除。</p>
        <div class="planet"></div>
        <div class="astronaut">
            <svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
                <path fill="#ffffff" d="M100,30 C120,30 140,50 140,70 C140,90 120,110 100,110 C80,110 60,90 60,70 C60,50 80,30 100,30 Z"></path>
                <ellipse cx="100" cy="65" rx="20" ry="25" fill="#ffffff"></ellipse>
                <path fill="#ffffff" d="M70,110 C70,110 70,140 100,140 C130,140 130,110 130,110 Z"></path>
                <rect x="85" y="130" width="30" height="40" fill="#ffffff"></rect>
                <rect x="90" y="165" width="5" height="20" fill="#ffffff"></rect>
                <rect x="105" y="165" width="5" height="20" fill="#ffffff"></rect>
                <rect x="75" y="135" width="5" height="20" fill="#ffffff" transform="rotate(-30 77 145)"></rect>
                <rect x="120" y="135" width="5" height="20" fill="#ffffff" transform="rotate(30 122 145)"></rect>
            </svg>
        </div>
    </div>
    <script>
        // 创建星星背景
        const starsContainer = document.getElementById('stars');
        const starCount = 100;
        
        for (let i = 0; i < starCount; i++) {
            const star = document.createElement('div');
            star.className = 'star';
            
            // 随机位置
            const left = Math.random() * 100;
            const top = Math.random() * 100;
            
            // 随机大小
            const size = Math.random() * 3;
            
            // 随机动画延迟
            const delay = Math.random() * 5;
            
            star.style.left = `${left}%`;
            star.style.top = `${top}%`;
            star.style.width = `${size}px`;
            star.style.height = `${size}px`;
            star.style.animationDelay = `${delay}s`;
            
            starsContainer.appendChild(star);
        }
    </script>
</body>
</html>